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Do you want the answer key with brief explanations for the Chemistry MCQs shown in these images (Q55-95), or help with selected questions only?

Solve all MCQs 55–95 with brief explanations

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python -c "from PIL import Image; im=Image.open('/tmp/workspace/attachments/1f68e441-842d-4b90-9fd1-dd66fe944c49/1000305717.jpg'); print(im.size); im.crop((90,920,690,1240)).resize((1800,960)).save('/tmp/q76.png')" && tesseract /tmp/q76.png stdout 2>/dev/null

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MDCAT chemistry MCQs Boyle law Arrhenius equation alkyl halide reactivity order

MCQs 55-95: Answers with brief explanations

Q	Answer	Brief explanation
55	D. Epistatic gene	An epistatic gene masks or modifies the effect of a gene at another locus.
56	B. 6.02 × 10²³ ions	One mole of Na⁺ contains Avogadro's number of sodium ions.
57	C. Number of protons	The charge-to-mass ratio of positive rays varies with the ion produced from the gas.
58	A. 4s < 3d < 4p < 5s	This follows the Aufbau energy-order rule.
59	C. P₁V₁ = P₂V₂	Boyle's law applies at constant temperature.
60	C. −273.16°C	Absolute zero is approximately −273.15°C.
61	D. Low external pressure	At high altitude, atmospheric pressure is lower, so water boils below 100°C and cooking takes longer.
62	C. High polarizability	Iodine molecules have stronger London forces because their electron cloud is more polarizable.
63	C. Ions can only vibrate at fixed positions	In a solid ionic lattice, ions cannot move freely to conduct electricity.
64	C. Cubic	Sodium chloride normally crystallizes in a cubic form.
65	A. Zero	(K_p = K_c) when (\Delta n = 0).
66	D. 7.35	Normal human blood pH is about 7.35-7.45.
67	D. Zero-order reaction	For a zero-order reaction, the units of (k) are the same as the units of rate.
68	B. (K = Ae^{-E_a/RT})	This is the Arrhenius equation.
69	A. (\sum \Delta H_{\text{cycle}} = 0)	Enthalpy is a state function, so its total change around a closed cycle is zero.
70	B. (\Delta E = q + w)	This is the first law of thermodynamics using the chemistry sign convention.
71	B. 2e⁻, 3H⁺	Balancing the half reaction gives: (H_2SO_3 + H_2O \rightarrow HSO_4^- + 3H^+ + 2e^-).
72	C. +7	In (KMnO_4), Mn has oxidation state +7.
73	A. Decrease in energy	Bond formation lowers the potential energy and makes the atom pair more stable.
74	A. Two σ and π bonds	O₂ has one sigma bond and one pi bond, meaning two bonds total.
75	B. F > Cl > Br	Ionization energy decreases down Group 17.
76	D. High shielding effect	Chlorine has more electron shells than fluorine, causing greater shielding and larger atomic size.
77	D. K	Potassium is less dense than water, so it can float.
78	A. Metallic bond strength	Down Groups IA and IIA, atomic size rises and metallic bonding becomes weaker.
79	C. Ba < Sr < Ca < Mg < Be	Electronegativity decreases down Group IIA.
80	A. Pyrrole	Pyrrole contains nitrogen, making it a heterocyclic compound.
81	D. −CONH₂	The functional group of an acid amide is (R-CONH_2).
82	C. Alkene	Heating an alcohol with concentrated (H_2SO_4) at 170°C removes water, forming an alkene.
83	B. Hept-2-ene	The longest chain has seven carbons and the double bond receives the lowest possible number, 2.
84	D. Addition reactions	Alkenes mainly react at their C=C double bond by addition.
85	C. 450°C and 1000 atm	Ethene polymerization to polythene requires high temperature and pressure.
86	D. R-I > R-Br > R-Cl > R-F	Alkyl-halide reactivity rises as the C-X bond becomes weaker.
87	C. Tertiary alcohol	In ((CH_3)_3C-OH), the carbon carrying the OH group is attached to three other carbon atoms.
88	D. Phenol	Phenol is used to produce phenol-formaldehyde resin, also called Bakelite.
89	B. Propanone	Oxidation of propanone can produce formic acid among its oxidation products.
90	Likely D. 3-Methylpentanal	Number the aldehyde carbon as carbon 1. The methyl group is on carbon 3. The printed structure is somewhat unclear in the image.
91	C. Phthalic acid	Benzene with two adjacent (-COOH) groups is phthalic acid.
92	B. P₂O₅	Phosphorus pentoxide is a dehydrating agent used to prepare acid anhydrides.
93	C. H₂	Carboxylic acids react with active metals to form a salt and hydrogen gas.
94	A. Myosin	Myosin is a major contractile protein involved in muscle contraction.
95	C. Salt bridges	Hemoglobin's polypeptide subunits are stabilized partly by ionic interactions, including salt bridges.

Answer key only:
55-D, 56-B, 57-C, 58-A, 59-C, 60-C, 61-D, 62-C, 63-C, 64-C, 65-A, 66-D, 67-D, 68-B, 69-A, 70-B, 71-B, 72-C, 73-A, 74-A, 75-B, 76-D, 77-D, 78-A, 79-C, 80-A, 81-D, 82-C, 83-B, 84-D, 85-C, 86-D, 87-C, 88-D, 89-B, 90-D, 91-C, 92-B, 93-C, 94-A, 95-C.

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Answer Key: MCQs 96-150

Physics

Q	Answer	Brief reason
96	C. 75°	For vertical height = horizontal range, (\tan \theta = 4), giving approximately 76°, nearest 75°.
97	B. 45°	Projectile range is maximum at 45°.
98	C	The Earth exerts gravitational force on the ball, pulling it downward.
99	C. Momentum	Total momentum of an isolated bomb-fragment system is conserved.
100	D. 180°	Work is negative when force and displacement are opposite.
101	D. Four times	(KE \propto v^2); doubling speed makes kinetic energy four times.
102	D. 80%	Approximate working efficiency of a dry cell battery.
103	B. More negative	As distance from Earth increases, gravitational potential energy increases from a negative value toward zero, so this question's wording likely intends the negative gravitational potential relation.
104	A. 10.8 MJ	(3,kWh = 3 \times 3.6 = 10.8,MJ).
105	B. Large speed and small radius	A steeper banking angle requires greater (v^2/r).
106	D. Net torque	Torque produces angular acceleration: (\tau = I\alpha).
107	B. Torque	Torque is the rotational analogue of force.
108	B. (\pi/180) radians	One degree equals (\pi/180) radians.
109	A. (\pi/2)	Centripetal acceleration is perpendicular to linear velocity.
110	B. (\lambda/2)	Two consecutive nodes are separated by half a wavelength.
111	B. Frequency	Frequency remains unchanged when sound enters another medium.
112	A. Blue shift	A star approaching Earth has a shorter observed wavelength.
113	C. Quadrupled	Intensity is proportional to amplitude squared.
114	B. Metabolism	Metabolism illustrates conversion and conservation of energy.
115	C. Increase in temperature and kinetic energy	Vigorous shaking supplies energy, raising molecular kinetic energy and temperature.
116	B. Universal gas constant	(C_p - C_v = R).
117	C. Stationary point charges	Coulomb's electrostatic law applies to stationary charges.
118	B. Direction of electric field	A positive charge accelerates in the direction of the field.
119	B. Constant	Half-life is constant for a given radioactive element.
120	C. Second	(RC = \Omega \times F = s).
121	B. Resistance	Temperature coefficient is fractional change in resistance per kelvin.
122	D. Conductor	Ohmic conductors obey Ohm's law at constant temperature.
123	B. Negative temperature coefficient	Semiconductor resistance decreases as temperature rises.
124	C. Magnetic flux density	Magnetic field lines per unit area represent flux density, (B).
125	D. Velocity, magnetic field and charge	(F = qvB\sin\theta).
126	B. 90°	Magnetic force is maximum when velocity is perpendicular to the field.
127	B. Dynamic e.m.f.	A generator works on electromagnetic induction due to motion.
128	A. Double	Induced e.m.f. is directly proportional to number of turns.
129	B. Electric signals	A seismograph converts ground vibrations into electrical signals.
130	B. Four diodes	A full-wave bridge rectifier uses four diodes.
131	C. Diode	A diode rectifies AC to DC.
132	B. Zero mass, finite momentum	A photon has zero rest mass but carries momentum.
133	A. Photoelectric effect	Solar cells and photoconductive devices use photoelectric phenomena.
134	D. Alpha particle	It has the greatest momentum among the options, hence the shortest de Broglie wavelength.
135	C. Lyman series	Transitions ending at (n=1) have the greatest energy and shortest wavelengths.

English

Q	Answer	Brief reason
136	C. Vagueness	Vagueness is the antonym of clarity.
137	A. Expelled from the house	“Evicted” means legally forced to leave a house/property.
138	B. Has been crying	Present perfect continuous fits “all morning.”
139	C. Will have taken over	“By 2040” requires future perfect tense.
140	B. Complex	It has a dependent time clause and an independent clause.
141	B	Correct punctuation: Milton, the great English poet, was blind.
142	C	Correct singular subject-verb agreement: A Sindhi woman is...
143	A. Against	One cautions someone against pickpockets.
144	B. Affect / effect	Sleep affects health and has an effect on grades.
145	C	Having finished his exercise, he put his books away.
146	B. He can be anything but not a liar	“Anything but” means definitely not.
147	B. Without apology, you will be punished	This is the meaning of “Unless you apologise...”
148	D. Have his revenge	“Pay off old scores” means take revenge.
149	A. Deeply	“Profoundly” means deeply.
150	B. Did not take it seriously	“Take with a pinch of salt” means treat with doubt or not take literally.

Answer sequence:
96-C, 97-B, 98-C, 99-C, 100-D, 101-D, 102-D, 103-B, 104-A, 105-B, 106-D, 107-B, 108-B, 109-A, 110-B, 111-B, 112-A, 113-C, 114-B, 115-C, 116-B, 117-C, 118-B, 119-B, 120-C, 121-B, 122-D, 123-B, 124-C, 125-D, 126-B, 127-B, 128-A, 129-B, 130-B, 131-C, 132-B, 133-A, 134-D, 135-C, 136-C, 137-A, 138-B, 139-C, 140-B, 141-B, 142-C, 143-A, 144-B, 145-C, 146-B, 147-B, 148-D, 149-A, 150-B.

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